General Troubleshooting Guide
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Negative Inventory

Problem

QuickBooks error message: You can't use negative rates on inventory items, use neg quantity instead. 

Description

Negative rates on inventory items

Solution

This means your discount item in QuickBooks is of type inventory. In QuickBooks, go to your item list. Rename the discount item and add _old to the name field. Recreate the discount item. As the item type, choose service or non-inventory.